2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/165108It is proved that every doubly stochastic quantum channel that is properly averaged with the completely depolarizing channel can be written as a convex combination of unitary channels. As a consequence, we find that the collection of channels expressible as convex combinations of unitary channels has non-zero Borel measure within the space of doubly stochastic channels.8 pagesQuantum Physicstext